Top press roll for paper-making machines



Dec. 1 1925- R. B. ADAMS ET AL TOP PRESS ROLL FOR PAPER MAKING MACHINES Filed Dec. 22. 1924 i but the porosity Patented Dec. 1, 1925:

UNITED STATES. PATENT OFFICE.

RALEIGH B. ADAMS Ami FREDERICK R. woonwnan; or NEWTON, MASSACHUSETTS, ASSIGNORS To sTowE &, WOODWARD COMPANY, OF NEWTON UPPER FALLS, MASSA- CHUSETTS, A CORPORATION OF MASSACHUSETTS.

TOP PRESS ROLL FOR PAPER-MAKING MACHINES.

Application filed December 22, 1924. Serial No. 757,529.

To all whom it may concern:

Be it known that we, RALEIGH B. ADAMS and F REDERIGK R. VVOODWARD, both citizens of the United States, and both residents of Newton, in the county of Middlesex and Commonwealth of Massachusetts, have invented a new and useful Top Press Roll for Paper-Making Machines, of which the following is a specification.

In the ordinary machine for making paper there is usually a pluralityof top press rolls and our invention is particularly useful when embodied in the first top press roll, the acting surface of which should be resilientbut such that the soft pulp willnot stick to it. Y

Our object is to provide such a press roll having a porous active surface or periphery is'provided by holes in the body itself of the roll.

We accomplish this object by compoundthe rubber, and in thisterm we include,

mg ru ber compound, with a chemical whichls finished and pounding rubber soluble in water so that when the roll is put into use on a paper machine the water, which is being squeezed out by the roll, dissolves out the minute particles of the chemical, leaving the acting surface porous and highly efficient for the prevention of sticking, there being infact holes or surface openings in the body itself, which give 'uniform action in the prevention of sticking. The figure in the drawing represents a top press roll in which the 'stipling A represents the holes or openings-in the surface of the body of the roll.

Any suitable chemical may be used which is soluble in' water but we prefer. to use sugar or common salt because. these lend themselves better to proper mixture with theru'bher or rubber compound and because they properly stand the vulcanizing conditicirlis whlch are desirable in making these 1'0 S. The process of'making our roll, the process being a feature of our invention. consists preferably in' thoroughly mixing or comor rubber compound with a chemical which" is soluble in'water, then preferably vulcanizingtthe com (mud to an iron core, then bringmg'the r01 into con-' --rubber is sufficiently intimate to provide uniformity so that when the soluble material. is dissolved out the holes are very .numerous and uniformly dispersed.

Rolls of the character referred to are usually operated with a doctor pressed against them and in the past this doctor has'had a glazing action on the'surfac-e of theroll, as, for example, when it has been attempted to provide porosity by combining fibrous material with the rubber, this glazed condition tending to cause the paper to stick to the rubber. With our roll however. the doctor, acting'with the water, tends to open the surface as the rubber wears and brings up more particles of soluble material to the action of the 'doctor and of the water andv thus the porous condition of the surface of the roll is vmaintained and consequentlyv sticking of the paper to the roll is prevented.

What we claim is:

1. A top press roll'whose surface com--- prises rubber and a chemical in water.

2. A vulcanized top press roll whose sur-' face comprises rubber and sodium. chloride.

3. A top press roll whose surface comprises rubber and a chemical soluble in Water, the chemical being from 10 to 50 per the surface of the roll by the action of water and a doctor leaving the surface of the rubber porous, and then, according as the-rubber wears, using the doctor and water. to open up said surface and to bring up more particles of said chemical to the surfaceof .the roll so as to be dissolved and thereby retain the porous condition of the surface.

RALEIGHB. ADAMS. f FREDERICK WOODWARD.

which is soluble 

